Demonstration of monolithic ytterbium-doped fiber amplifier with record power of 5.1 kW emitting at 1100 nm

IF 2.7 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2025-08-27 DOI:10.1016/j.yofte.2025.104379

Xiangming Meng , Peng Wang , Xiaoyong Xu , Hanshuo Wu , Baolai Yang , Xiaoming Xi , Hanwei Zhang , Xiaolin Wang , Jinbao Chen

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引用次数: 0

Abstract

Wavelength extension of high-power fiber lasers holds critical importance for spectral combining systems. In this work, we demonstrate a 5.1 kW all-fiber amplifier operating at 1100 nm based on master oscillator power amplifier (MOPA). When designing fiber lasers operating at wavelengths above 1080 nm, effective suppression of stimulated Raman scattering (SRS) and transverse mode instability (TMI) must be prioritized. The length of the ytterbium-doped fiber (YDF) was optimized to mitigate SRS while maintaining high power conversion efficiency. Wavelength-stabilized laser diodes (LDs) at 981 nm were employed to reduce quantum defect and enhance the TMI threshold. By optimizing the trade-off between total pump absorption and SRS intensity, a slope efficiency of 75.7 % and an optical signal-to-noise ratio (OSNR) of 23.5 dB were achieved. At 5100 W, the high beam quality was maintained with M²_x/M²_y = 2.39/2.33. Experimental results demonstrate that SRS significantly degrades beam quality through spectral broadening and power transfer to Stokes waves. This work establishes an important reference for extending monolithic fiber amplifier wavelengths beyond conventional bands while maintaining multi-kilowatt performance.

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单片掺镱光纤放大器的演示，记录功率为5.1 kW，发射波长为1100nm

高功率光纤激光器的波长扩展对光谱组合系统至关重要。在这项工作中，我们展示了一个基于主振荡器功率放大器（MOPA）的5.1 kW全光纤放大器，工作在1100 nm。在设计1080 nm以上波长的光纤激光器时，必须优先考虑有效抑制受激拉曼散射（SRS）和横向模不稳定性（TMI）。在保持高功率转换效率的同时，对掺镱光纤（YDF）的长度进行了优化，以减轻SRS。采用981 nm波长稳定激光二极管（LDs）减少量子缺陷，提高TMI阈值。通过优化总泵浦吸收和SRS强度之间的平衡，实现了75.7%的斜率效率和光信噪比（OSNR）为23.5 dB。5100 W时，M2x/M2y = 2.39/2.33，保持高光束质量。实验结果表明，SRS通过谱展宽和功率向斯托克斯波的转移，显著降低了光束质量。这项工作为在保持多千瓦性能的同时，将单片光纤放大器的波长扩展到常规波段之外提供了重要的参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.